115 lines
2.5 KiB
PHP
115 lines
2.5 KiB
PHP
<?php
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/**
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* Cache with file system
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*/
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class FileCache implements CacheInterface {
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protected $param;
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public function loadData(){
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$this->isPrepareCache();
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$datas = unserialize(file_get_contents($this->getCacheFile()));
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return $datas;
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}
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public function saveData($datas){
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$this->isPrepareCache();
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$writeStream = file_put_contents($this->getCacheFile(), serialize($datas));
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if(!$writeStream) {
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throw new \Exception("Cannot write the cache... Do you have the right permissions ?");
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}
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return $this;
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}
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public function getTime(){
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$this->isPrepareCache();
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$cacheFile = $this->getCacheFile();
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if(file_exists($cacheFile)){
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return filemtime($cacheFile);
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}
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return false;
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}
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public function purgeCache(){
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$cacheTimeLimit = time() - 86400; // 86400 -> 24h
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$cachePath = $this->getCachePath();
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if(file_exists($cachePath)){
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$cacheIterator = new RecursiveIteratorIterator(
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new RecursiveDirectoryIterator($cachePath),
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RecursiveIteratorIterator::CHILD_FIRST
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);
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foreach($cacheIterator as $cacheFile){
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if(in_array($cacheFile->getBasename(), array('.', '..')))
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continue;
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elseif($cacheFile->isFile()){
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if(filemtime($cacheFile->getPathname()) < $cacheTimeLimit)
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unlink($cacheFile->getPathname());
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}
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}
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}
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}
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/**
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* Set HTTP GET parameters
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* @return self
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*/
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public function setParameters(array $param){
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$this->param = $param;
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return $this;
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}
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/**
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* Cache is prepared ?
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* Note : Cache name is based on request information, then cache must be prepare before use
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* @return \Exception|true
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*/
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protected function isPrepareCache(){
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if(is_null($this->param)){
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throw new \Exception('Please feed "setParameters" method before try to load');
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}
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return true;
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}
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/**
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* Return cache path (and create if not exist)
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* @return string Cache path
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*/
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protected function getCachePath(){
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$cacheDir = __DIR__ . '/../cache/'; // FIXME : configuration ?
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if(!is_dir($cacheDir)){
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mkdir($cacheDir, 0755, true);
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chmod($cacheDir, 0755);
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}
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return $cacheDir;
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}
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/**
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* Get the file name use for cache store
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* @return string Path to the file cache
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*/
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protected function getCacheFile(){
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return $this->getCachePath() . $this->getCacheName();
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}
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/**
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* Determines file name for store the cache
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* return string
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*/
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protected function getCacheName(){
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$this->isPrepareCache();
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$stringToEncode = $_SERVER['REQUEST_URI'] . http_build_query($this->param);
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$stringToEncode = preg_replace('/(\?|&)format=[^&]*/i', '$1', $stringToEncode);
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return hash('sha1', $stringToEncode) . '.cache';
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}
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}
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